将json中超过20万个字符的查询字符串发送到api-c#

我想发送一个通过json转换为base64的jpeg图像。图像大小约为660kb，转换后的字符长度约为200万。我需要的是将它发送到api？？如果可能的话，在查询字符串中。

我得到的错误是字符串太长。有其他选择吗？

        HttpClient client = new HttpClient();
        string uploadJson = "http://mylink/WebApi/api/uploadPhoto?jsonImage=" + jsonImage + "&IdOdl=" + IdOdl + "&SnDevice=" + SnDevice + "&cod=" + cod + "&IdTechnician=" + IdTechnician + "&id_producer=" + id_producer + "&pdr=" + pdr;
        client.BaseAddress = new Uri(uploadJson);
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        Task<HttpResponseMessage> response = client.GetAsync(uploadJson);
        HttpResponseMessage res = response.Result;
        if (!res.IsSuccessStatusCode)
        {
            Console.Write("Error upload");
        }